电焊机房内温度异常高温是何原因造成的?
参考答案:室内的通风系统未及时开启,电焊机工作时的高温不能及时排除。
阅读短文,判断正(T)误(F)。
It's a fine Saturday morning. There are many children on a small hill. They're students of No. 3 Middle
School. They're Miss Liu's students. Miss Liu is with them.
What are they doing? They are having their May Day. Are they playing games on the hill? No, they aren't
playing games now. They are planting trees and flowers. Some of the girls are carrying water for the new trees
and flowers. Miss Liu is helping them. They are all working hard. And they all look happy, too.
( )1. The students of No. 3 Middle school are on a hill one morning.
( )2. It's May Day today.
( )3. Some children are playing games on the hill.
( )4. Some girls are carrying water for the trees and flowers.
( )5. All of the children are very happy.
急性链球菌感染后肾炎,补体C3恢复时间多为()
A.2周以内
B.4周以内
C.8周以内
D.3个月以内
E.6个月以内